Browsing by Subject "flash-flood"

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    Morfología Fluvial.-Funcionamiento de la rambla de Nogalte (Murcia) durante avenidas. Implicaciones para la cartografía de peligrosidad por riesgo de avenidas
    Ortega Becerril, J.A.; Garzón Heydt, M.G.; García López-Davalillo, J.C.; Rodriguez Franco, A.; Universidad de Murcia
    ABSTRACT Discharge data obtained for the Rambla de Nogalte ephemeral stream by means of hydrologic modelling are low in relation to the discharge that was estimated for the 1973 catastrophic flood event. Watershed characteristics such as an elongated morphology, long stream and moderate slope defining a high concentration time do not favour either large discharge. The reason for it might be the high load attained on the 1973 flood not taken in account for the ordinary hydrologic modelling and the lack of flow evacuation capacity of the aggrading alluvial fan system at the stream mouth.
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    Morfología Fluvial.-Influencia antrópica en la avenida de 1997 en el río Rivillas (Badajoz). Cambios de usos e impacto geomórfico
    Ortega Becerril, J.A.; Garzón Heydt, M.G.; Universidad de Murcia
    ABSTRACT The Rivillas Stream, a tributary of the Guadiana River, is a small, seasonal watercourse that sporadically floods. The flooding that occurred on the 5th November 1977 was catastrophic; 22 deaths were recorded in the river’s basin plus another 15 in neighbouring basins. The intense transformation of the basin through agriculture and construction near the city of Badajoz have led to this river system becoming very unstable. This is equally true of its floodplain, its main course, its affluents, the slopes around the basin, and the remainder of the basin. The geomorphic impact of these changes only became noticeable when the flashflood occurred due to intense rainfall, highlighting the important negative effects of human activity in such sensitive environments.